Pinetab2 not starting

[tllim]

My Pinetab2 does not appear to be accepting power. It worked for months, then, after being untouched (while plugged in) for a couple of weeks, it wouldn't work right. Even with power plugged in the power-port, won't start.

Shortly before the battery totally drained, it would try to power on for a couple of seconds, then turn off.

Tried multiple cables & charging devices. I figure that even if the battery is having issues, with being plugged in it would still power up. Maybe trouble with the usb-c port or something else? Any ideas?

Using accompanied UART dongle and check whether their is console message.